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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Girault, J. A. Greengard, P. Nairn, A. C. Kwon, Y. G. Desdouits, F. Huang, H. B. |
| Description | Author Affiliation: Kwon YG ( Laboratory of Molecular and Cellular Neuroscience, The Rockefeller University, New York, NY 10021, USA.); |
| Abstract | The catalytic subunit of PP-1 (PP-1C) is potently inhibited (IC50, approximately 1 nM) by DARPP-32 (dopamine- and cAMP-regulated phosphoprotein, M(r) 32,000), inhibitor-1, and inhibitor-2. The NH2-terminal 50 amino acid residues of DARPP-32 and inhibitor-1 are similar, and phosphorylation of a common threonine residue (Thr-34/Thr-35) is necessary for inhibition of PP-1C. We have characterized further the interaction between DARPP-32 and PP-1C. Using synthetic peptides derived from the NH2-terminal region of DARPP-32, residues 6-11, RKKIQF, have been shown to be required for inhibition of PP-1C. Peptides containing this motif were able to antagonize the inhibition of PP-1C by phospho-DARPP-32 and phosphoinhibitor-1. The inhibition of PP-1C by inhibitor-2, but not by okadaic acid, microcystin, or calyculin A, was also attentuated by these antagonist peptides. These results together with results from other studies support a model in which two subdomains of phospho-DARPP-32 interact with PP-1C. The region encompassing phospho-Thr-34 appears to interact with the active site of the enzyme blocking enzyme activity. The region encompassing the RKKIQF motif binds to a domain of PP-1C removed from the active site. Amino acid sequence analysis indicates that basic and hydrophobic features of the RKKIQF motif are conserved in the binding domains of certain PP-1C targeting proteins, suggesting that interaction of inhibitor proteins and targeting proteins may be mutually exclusive. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 8 |
| Volume Number | 94 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1997-05-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Enzyme Inhibitors Metabolism Nerve Tissue Proteins Phosphoprotein Phosphatases Phosphoproteins Amino Acid Sequence Animals Dopamine And CAMP-Regulated Phosphoprotein 32 Pharmacology Molecular Sequence Data Antagonists & Inhibitors Protein Binding Protein Phosphatase 1 Recombinant Proteins Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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